“One of the most important of these ceremonial functions is called Urja-vrata. Urja-vrata is observed in the month of Karttika (October-November); especially in Vrndavana, there is a specific program for temple worship of the Lord in His Damodara form. “Damodara '' refers to Krsna’s being bound with rope by His mother, Yasoda. It is said that just as Lord Damodara is very dear to His devotees, so the month known as Damodara or Karttika is also very dear to them.
“The execution of devotional service during Urja-vrata in the month of Karttika is especially recommended to be performed at Mathura. This system is still followed by many devotees. They go to Mathura or Vrindavan and stay there during the month of Karttika specifically to perform devotional services during this period. In the Padma Purana it is said, “The Lord may offer liberation or material happiness to a devotee, but after some devotional service has been executed, particularly in Mathura during the month of Karttika, the devotees want only to attain pure devotional service unto the Lord.” The purport is that the Lord does not award devotional service to ordinary persons who are not serious about it. Even after such not serious persons who execute devotional service according to the regulative principles during the month of Kartika, and within the jurisdiction of Mathura in India, are very easily awarded the Lord’s personal service.”
Glories of offering a lamp in Kartika
In the skanda Purana, Lord Brahma and Sage Narada, converse that "the month of Kartika is very dear to Lord Krsna"
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When one offers a lamp during the month of Kartika, his sins of many thousands and millions of births perish in half an eye blink.
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Even if there are no mantras, ni pious deeds, and no purity, everything becomes perfect when a person offers a lamp during the month of Kartika.
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A person who during the month of Kartika offers a lamp to Lord Keshava has already performed all yajnas (sacrifice for the pleasure of the Lord) and bathing in all the holy rivers.
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The ancestors say "when someone in our family pleases Lord Keshava by offering Him a lamp during the month of Kartika, then by the mercy of the Lord who holds the Sudarshan-Chakra in His hand, we will all attain liberation.
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To one who either at home or in a temple offers a lamp during the month of Kartika, Lord Vasudeva gives a great result.
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A person who. offering a lamp to Lord Krishna during the month of Damodara (Kartika) becomes very glorious and fortune.
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No sins exist anywhere in the three worlds that will not be purified by offering a lamp to Lord Keshava during Kartika.
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A person who offers a lamp to Lord Damodara during Kartika attains the eternal spiritual world where there is no suffering.